The new issue of Shofar
includes an article comparing Don Quixote
with the Zohar. For more comparisons of Don Quixote with Jewish works, see Hananel Mack, 'Shotim, Meshotetim ve-Don Kishotim'
, Masekhet 4 (2005). And another, fascinating article, suggesting Jewish literary influence on another Spanish medieval classic - Michelle Hamilton, Rereading the widow : a possible Judeo-Iberian model for the Pseudo-Ovidian "De Vetula" and the "Libro de buen amor", Speculum 82,1 (2007) 97-119.
And an article here
comparing the attitudes of Saadya Gaon and Shabtai Donalo to Sefer Yetsira.